you need to switch which unit is the master unit.. it seems as if the smaller unit is the master, and the 28 is having to piggyback off it... i dont know how to do it, but you need to make the 28 the master, and piggyback the 520.
Thanks, Ronnie.......I'll figure it out. I was sitting in the boat at daylight trying things. There isn't a lot of info on the network part of it!!